/*-----------------------------------------------------------------------*/
/* Low level disk I/O module skeleton for FatFs     (C)ChaN, 2007        */
/*-----------------------------------------------------------------------*/
/* This is a stub disk I/O module that acts as front end of the existing */
/* disk I/O modules and attach it to FatFs module with common interface. */
/*-----------------------------------------------------------------------*/

#include "diskio.h"
#include <stdio.h>
#include <string.h>
#include "FATFileSystem.h"

#include "mbed.h"

DSTATUS disk_initialize (
	BYTE drv				/* Physical drive nmuber (0..) */
)
{
	FFSDEBUG("disk_initialize on drv [%d]\n", drv);
	return (DSTATUS)FATFileSystem::_ffs[drv]->disk_initialize();
}

DSTATUS disk_status (
	BYTE drv		/* Physical drive nmuber (0..) */
)
{
	FFSDEBUG("disk_status on drv [%d]\n", drv);
	return (DSTATUS)FATFileSystem::_ffs[drv]->disk_status();
}

DRESULT disk_read (
	BYTE drv,		/* Physical drive nmuber (0..) */
	BYTE *buff,		/* Data buffer to store read data */
	DWORD sector,	/* Sector address (LBA) */
	BYTE count		/* Number of sectors to read (1..255) */
)
{
	FFSDEBUG("disk_read(sector %d, count %d) on drv [%d]\n", sector, count, drv);
	for(unsigned int s=sector; s<sector+count; s++) {
		FFSDEBUG(" disk_read(sector %d)\n", s);
		int res = FATFileSystem::_ffs[drv]->disk_read((char*)buff, s);
		if(res) {
			return RES_PARERR;
		}
		buff += 512;
	}
	return RES_OK;
}

#if _READONLY == 0
DRESULT disk_write (
	BYTE drv,			/* Physical drive nmuber (0..) */
	const BYTE *buff,	/* Data to be written */
	DWORD sector,		/* Sector address (LBA) */
	BYTE count			/* Number of sectors to write (1..255) */
)
{
	FFSDEBUG("disk_write(sector %d, count %d) on drv [%d]\n", sector, count, drv);
	for(unsigned int s=sector; s<sector+count; s++) {
		FFSDEBUG(" disk_write(sector %d)\n", s);
		int res = FATFileSystem::_ffs[drv]->disk_write((char*)buff, sector);
		if(res) {
			return RES_PARERR;
		}
		buff += 512;
	}
	return RES_OK;
}
#endif /* _READONLY */

DRESULT disk_ioctl (
	BYTE drv,		/* Physical drive nmuber (0..) */
	BYTE ctrl,		/* Control code */
	void *buff		/* Buffer to send/receive control data */
)
{
	FFSDEBUG("disk_ioctl(%d)\n", ctrl);
	switch(ctrl) {
		case CTRL_SYNC:
			if(FATFileSystem::_ffs[drv] == NULL) {
				return RES_NOTRDY;
			} else if(FATFileSystem::_ffs[drv]->disk_sync()) {
				return RES_ERROR;
			}
			return RES_OK;
		case GET_SECTOR_COUNT:
			if(FATFileSystem::_ffs[drv] == NULL) {
				return RES_NOTRDY;
			} else {
				int res = FATFileSystem::_ffs[drv]->disk_sectors();
				if(res > 0) {
					*((DWORD*)buff) = res; // minimum allowed
					return RES_OK;
				} else {
					return RES_ERROR;
				}
			}
		case GET_BLOCK_SIZE:
			*((DWORD*)buff) = 1; // default when not known
			return RES_OK;

	}
	return RES_PARERR;
}

